Online play?
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I'm really interested in playing this mod, especially if it'll be possible to play other people in multiplayer, but I'm not sure how I'll find people with the same mod installed. Will there be a TS Rising lobby where people can meet up and play?

Its simpele. All players that have no such mod wouldn't even see your game. Your game will only see players whith such version of the mod as yours. Game will see it like another version of the game.
I suggest you to contact players here when mod will be released and create hamachi server...